Via Composer:

Via ZIP file:

Once you download the library, move the twilio-php folder to your project
directory and then include the library file:

require '/path/to/twilio-php/Services/Twilio.php';

and you're good to go!

A Brief Introduction

With the twilio-php library, we've simplified interaction with the
Twilio REST API. No need to manually create URLS or parse XML/JSON.
You now interact with resources directly. Follow the Quickstart
Guide
to get up and running right now. The User
Guide shows you
how to get the most out of twilio-php.